ULN 2550. 25 or 50 MHz GPSDO DOCXO Module with LVDS and CMOS Outputs
ULN 2550. 25 or 50 MHz GPSDO DOCXO Module with LVDS and CMOS Outputs
2 PagesThe ULN 2550 is a 25 or 50 MHz GPSDO module using a DOCXO to deliver precise timing, achieving ±30 ns RMS 1 PPS accuracy when GPS‑locked and frequency accuracy better than ±3E‑10 after one hour of lock. Holdover stability remains within ±7 µs over 24 hours at 25°C after extended GPS conditioning. ADEV performance is under 5E‑11 from 1 to 1000 seconds. It provides two OCXO‑steered 1 PPS outputs (CMOS and LVDS) and six frequency outputs, including four LVDS at 25/50 MHz, one CMOS 100 MHz, and one CMOS 10 MHz. Control is available through TTL‑level RS‑232 with SCPI‑99 and NMEA‑0183 support. The module operates on GPS L1 C/A with passive or active antennas.
